净水厂中全氟化合物分布特征及UV/SO_3^(2-)的去除机理  

Distribution of Perfluorinated Compounds in Water Supply Plant and Its Reductive Degradation by UV/SO_3^(2-)

作　　者：周浩 孙敏[1,2] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098

出　　处：《中国给水排水》2017年第19期6-10,15,共6页China Water & Wastewater

基　　金：国家重点研发计划项目(2016YFC0400803);江苏高校优势学科建筑工程资助项目

摘　　要：通过考察长江原水和南方某净水厂各单元处理工艺中5种全氟化合物(PFCs)的分布特征,分析了各单元对PFCs的去除效果,并探讨了UV/SO_3^(2-)光还原技术降解饮用水中PFCs的机理。长江原水经过净水厂处理后,总PFCs去除率为35.33%,其中混凝沉淀工艺对PFCs的去除率最高,臭氧和氯消毒工艺会造成PFCs的增加;采用波长为365 nm、功率为500 W的紫外灯激发SO_3^(2-)产生的水合电子能够降解水中的PFCs。当PFCs初始浓度为1 mg/L、SO_3^(2-)浓度为0.4 g/L、p H值为8.5时,5种PFCs的降解均符合一级反应动力学;PFDA降解的中间产物表明UV/SO_3^(2-)技术是通过逐步脱去CF2实现降解的。The distribution characteristics of five peffluorinated compounds （PFCs） in Yangtze River raw water and treatment processes of a water supply plant were analyzed. The results showed that the removal efficiency of PFCs in the water plant was limited with the removal rate of 35.33%. The coag- ulation unit was the most efficient in removing PFCs. PFCs concentration increased after ozonation and disinfection. In order to effectively remove the PFCs, UV/SO3^2- reduetive degradation process was pro- posed, and its photodegradation mechanism was investigated. SO3^2-could produce hydrated electron un- der 365 nm and 500 W UV irradiation, which contributed to the removal of PFCs. When the initial con- centration of PFCs was 1 mg/L, concentration of SO3^2- was 0.4 g/L, pH was 8.5, the degradation of five PFCs was in accordance with first-order reaction kinetics. The degradation products of PFDA indicated that degradation of PFCs were achieved by gradual removal of CF2 in this system.

关 键 词：净水厂 PFCS UV UV/SO3^2- 水合电子 

分 类 号：TU991.2[建筑科学—市政工程]